This post deals with pregnancy loss and might be triggering for some readers.

Jessica and Lisa Origliasso have undoubtedly had a tough year.

The Aussie twin sisters, who are better known as singing duo The Veronicas, have collectively endured a break up and pregnancy loss, on top of a global pandemic.

And now, the pair have announced they're postponing their upcoming Sydney concerts to be with their mother Colleen, who is suffering from Lewy body dementia.

Sharing the news on Instagram earlier today, the 35-year-olds explained that their concert, which was meant to celebrate the 15th anniversary of their debut albumThe Secret Life Of...,would be moved to next year.

Now watch The Veronicas on 'Who's In The Car'. Post continues after video.

"We are needed back home in Brisbane to be with our mummy, and due to COVID restrictions we have left Sydney and started our quarantine in Byron Bay," they wrote to their to their 134,000 followers.

"We know most of you understand that this is a deeply sensitive time for our family. That requires priority."

The Veronicas explained that a replacement show would be held in Byron Bay on November 17.

"It will be acoustic and as intimate as we can get with our clothes on. See you there. Love Jessica and Lisa Marie," they ended the post.

Here's what else has been happening with The Veronicas lately.

The Veronicas are now carers for their mum.

The sisters have been acting as carers for their 72-year-old mum, Colleen, who was diagnosed with Lewy body dementia two years ago. The debilitating disease causes thinking, memory and movement to decline.

Speaking to Stav, Abby & Matt in October, The Veronicas explained how "incredibly difficult" the work has been. But they say it's worth it to give back to their "hero".

"We are in awe every day of this woman. Just our absolute hero, and to be able to care for her, give back to her even a tiny bit of the love she has thrown us throughout our lives is an absolute honour... but it is incredibly difficult work," they said.

"It's heartbreaking. You're grieving. Your best friend, your mummy... and you know the statistics. There are 2.6 million unpaid carers in Australia and a lot of them don't even realise they are carers."

"We're just here to say that if you are someone who is caring for a loved one - a friend or family member - that we see you and thank you for everything you're doing.'"

They also shared a heartfelt video of them with their mum on Instagram for National Carers Week.

"Caring for Mama is the most challenging thing we've ever had to do. It's definitely the most rewarding. And I think we're lucky that we have each other," said Lisa.

"On the days where emotionally it's indescribably hard, we can really count on each other to understand."

In March, the sisters shared that their mum had also been diagnosed with progressive supranuclear palsy, an extremely rare neurological condition.

"There is no cure, no treatment, and little to no research, support or funding to do with this disease. It presents itself in the most cruel and debilitating symptoms, losing all motor and cognitive function over the course of a few years. I won’t begin to tell you here what that looks like. It’s absolute hell," Jessica wrote in a post for International Women's Day.

"I will never have the words to explain how unbearable it is to see someone you love go through something like this. The awareness of this disease comes second only to the note of strength my incredible Mummy has shown every step of the way. We are so blessed she is our mummy."